MariaDB [(none)]> install soname 'ha_tokudb';
ERROR 1126 (HY000): Can't open shared library 'ha_tokudb.so'
(errno: 8, API version for STORAGE ENGINE plugin TokuDB not
supported by this version of the server)

The latter is a bit more descriptive, but the former is fairly
cryptic.

Given the latter, as you may have guessed it, if you run into
either of these, you have the wrong version of ha_tokudb.so in
your plugin directory – that is, it is not the correct version
for your MariaDB/MySQL.

In both cases, 10.0.11 was used. In the first case, the
ha_tokudb.so was from …

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